I run an app called NoSleep whose menu bar icon was initially black when it was off and blue when it was turned on.
A few OS versions back the "on" blue changed to grey while the "off" black remained as it was, and now in Mojave, the blue has morphed into a blank space while the black again remains as it was.
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
